The Cygnus X-1 system consists of a black hole with a mass about 10 times that of the Sun in a close orbit with a blue supergiant star with a mass of about 20 Suns.

We now know Cygnus X-1 contains a black hole and a star in a binary system. The star is also classified as the variable star V1357 Cygni, a hot supergiant (think Rigel) with an O9.7 spectral ...

Cygnus X-1 began as a star that was approximately 60 times the sun's mass that collapsed tens of thousands of years ago. It orbits a companion star every five and a half days at one-fifth of the ...

The band's classic multi-movement opus "Cygnus X-1" took on all comers in our Rock Star Wars tournament, soaring through our carefully arranged series of intergalactic battles between 32 space ...

To resolve the black hole, they used the Event Horizon Telescope, a global radio telescope array with an effective aperture the size of the Earth. One participating EHT telescope, highlighted here, is ...

The competition is getting fierce as Rush's deep-space magnum opus "Cygnus X-1" goes head-to-head against Styx's "Come Sail Away" in this round of our Rock Star Wars tournament. To try and fill ...

Weighing in at roughly 21 solar masses, the black hole in the X-ray binary system Cygnus X-1 is so massive that it challenges current stellar evolution models, a new study reveals.

Using several telescopes, both ground-based and in orbit, the scientists unravelled longstanding mysteries about the object called Cygnus X-1, a famous binary-star system discovered to be strongly ...

WHAT’S NEW — In 1971, Cygnus X-1 became the first black hole to be observed from Earth. While black holes had long been predicted theoretically, Cygnus X-1 became the first to be positively ...

The X-ray-emitting binary system Cygnus X-3 features a massive star donating matter to a compact object, probably a black hole. That may explain its perplexing brightness.